:root{
  --bg:#f6f7fb; --card:#ffffff; --text:#0f172a; --muted:#6b7280; --border:#e5e7eb; --accent:#111827;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif}
.container{max-width:1120px;margin:0 auto;padding:24px}
.topbar{position:sticky;top:0;z-index:20;background:#fff;backdrop-filter:blur(6px);border-bottom:1px solid var(--border)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:1120px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:32px;height:32px;border-radius:10px;background:#000}
.badge{border:1px solid var(--border);background:#f8fafc;border-radius:999px;padding:4px 8px;font-size:12px;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px}
.input{width:100%;border:1px solid var(--border);border-radius:12px;padding:10px 12px;font-size:14px;background:#fff}
.label{display:block;font-size:12px;font-weight:600;color:var(--muted);margin-bottom:6px}
.row{display:flex;align-items:center;justify-content:space-between}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:12px;background:#000;color:#fff;border:none;padding:10px 14px;font-weight:600;cursor:pointer}
.btn-outline{background:#fff;color:#000;border:1px solid var(--border)}
.cards{display:grid;gap:20px;grid-template-columns:1fr}
@media(min-width:980px){ .cards{grid-template-columns:repeat(2,1fr)} }
.product{position:relative;overflow:hidden;border-radius:16px;border:1px solid var(--border);background:#fff;display:flex;flex-direction:column}
.serial{position:absolute;left:12px;top:12px;background:#000;color:#fff;font-size:12px;width:28px;height:28px;border-radius:999px;display:flex;align-items:center;justify-content:center}
.cover{height:180px;width:100%;object-fit:cover}
.p16{padding:16px}
.title{font-size:18px;font-weight:700;margin:0 0 6px 0}
.desc{font-size:14px;color:var(--muted);margin:0 0 10px 0}
.meta{font-size:12px;color:var(--muted)}
.price{font-size:20px;font-weight:800;text-align:right}
.footer{font-size:12px;color:var(--muted);text-align:center;padding:40px 0}